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RFC 1700 - spi-numbers

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    SECURITY PARAMETERS INDEX

    The Security Parameters Index is a 32-bit number used to identify the
    security association of a datagram in certain security procedures
    [RFC1826, RFC1827].  The first 256 SPI values are assigned by the IANA
    and listed here.

    Number         Description
    -------------- -------------------------------------------------------------
         0         Reserved  - Used to indicate that no security
                               association has been established         [RFC1827]

         1         SKIP      -                                          [Markson]

         1 - 255   Reserved by the IANA

    DOCUMENTS

    [RFC1826]  Atkinson, R., "IP Authentication Header", RFC 1826, Naval
               Research Laboratory, August 1995.

    [RFC1827]  Atkinson, R., "IP Encapsulating Security Payload (ESP)",
               RFC 1827, Naval Research Laboratory, August 1995.

    PEOPLE

    [Markson]  Tom Markson, , August 1995.

    []

Connected: An Internet Encyclopedia
RFC 1700 - spi-numbers